North Korea has recently conducted engine tests for an intercontinental ballistic missile that could potentially deliver a nuclear warhead to the United States, a U.S. think tank said on Friday.

North Korea conducted at least one engine test for the KN-08 missile in late March or early April, the think tank 38 North said, marking the latest in a series of tests for a missile believed to have a range of more than 10,000 km (6,000 miles).

Following the engine tests, the next stage for North Korea would be a test launch of the missile, according to 38 North, which is affiliated with Johns Hopkins University's U.S.-Korea Institute.

"As this effort progresses, the next technically logical step in the missile’s development would be a flight test of the entire system," 38 North said in its report.(Reuters)